Valve



Dec. 9, 1941. RG'. CARLSON 2,265,596

VALVE Filed March 24, 1941 E E l n `I lll @Uefa/vn v Patented Dec. 9,1941 VALVE Ralph G. Carlson,

Chicago, lll., assignor to Crane Co., Chicago, Ill., a corporation ofIllinois Application March 24, 1941, Serial No. 384,805

3 Claims.

This invention relates to a new and improved type of swing check valveand is a continuation in part of my original application identifiedSerial No. 286,111 filed July 24, 1939.

Heretofore it has been common knowledge that one of the objectionablefeatures usually present in the operation of the conventional swingcheck valves has been the tendency for the valve, upon seating withoccurrence of backfiow within the pipe line, to pound or to chatter andeventually, depending upon the extent of such pounding, to cause theclosure member to seat improperly due to the damage done to the hingepin or the hinge, and in many cases to` actually deface the valve seator closure member before the cause could be detected and remedied. Infurther explanation, to those skilled in the art, it is accepted thatupon the occurrence of backow or with a drop in line pressure the forcewhich draws the valve to its seat may frequently be very substantial,creating a slamming or pounding which places objectionable strain uponsuch valve elements as the hinge pin, the hinge, and the closure member,without adequate relief therefor.

Therefore, it is one of the principal objects of my invention to providea swing check valve in which a transverse reinforcing member eitherintegral therewith or separately is used to provide a betterdistribution of such operating strains so as to avoid distortion andbreakage of the parts involved. More particularly, a holding membercooperating with the usual clapper hinge member functions to provide apredetermined amount of clearance in the clapper or closure member tocreate smooth and substantially trouble-free operation.

Another important object lies in providing a more uniform distributionof stress loads in contradistinction to concentrating, as heretofore, ona certain part or parts which ultimately resulted in valve failure.

Another important object of my invention is the provision of a separateinsertable member for cushioning between the hinge and the transverseholding and reinforcing member so as to further eliminate possibility ofdamage from sudden strain.

Other objects and advantages will become more readily apparent uponproceeding with the specification in connection with the drawing, inwhich Fig. 1 is a sectional assembly view showing one embodiment of aclosure member in a valve employing my invention.

Fig. 2 is a sectional view taken on the line 2 of Fig. 1.

Fig. 3 is a fragmentary sectional view taken on the line 3-3 of Fig. 2.

Fig. 4 is a partial sectional View of the disc and hinge in assemblywith a further modificaviews.

"having the bolted cap 3 held in leak-proof retion employing theprinciple of my invention.

Fig. 5 is a fragmentary sectional view taken on the line 5-5 of Fig. 4.

Like numerals refer to like parts in the various Referring now to Fig.1, the valveconsists of the usual body or casing I provided with' theend flanges or other suitable connections 2 for attachment to apipeline, the valve preferably lation to the casing I by means ofthe'bolts 4. Transversely extending across the ports 5 is the swivelablydisposed closure member 6 vwhich is attached, as at the hinge 1, to thepin 8 preferably held in non-rotatable relation to the said hinge bymeans of the square key 9.v As more clearly shown in Fig. 2, the pin 8is journally supported within the opposite disposed integral bosses I0of the casing I. The closure member 6 seats upon the seat ring IIforming the usual seal therefor. The seat ring Il obviously may be madeintegral with the casing rather than as a separate unit, as shown.

Attention is now directed to the attachment between the hinge 1 and theclosure member 6 in which construction the principle of my inventionlies. More specically, it will be noted that a holding member I2 isfixedly attached to the closure member 6 by means of the bolts I3, thelatter providing an abutting contact as at 6a (see Fig. 3). A projectingportion I4 upon the hinge 1, as more clearly shown in Fig. 2, engagesthe hollow or grooved section I2a. of the holder I2 and the hinge 1, thegeneral plan or contour being more clearly shown by the dotted lines ofFig. 2. The projecting portion I4 thus serves the following functions:first, as between the hinge and the closure member the projectingportion allows for suicient clearance so that when the load is suddenlyplaced upon the hinge in being seated such load is transmitted to itsplane surface and thereby distributes the load over a larger area ratherthan to concentrate it upon the hinge itself; secondly, the projectingportion serves as a means in cooperation with the bolts I3 to preventthe rotation of the closure member 6; and thirdly, it limits thetransverse movement of the closure member relative to the hinge. Theclosure member 6 and the transverse holding member I2 preferablyfunction as if constructed integrally, the holding member I2 being rmlyfastened upon the closure member 6. 'I'he shank of the hinge 'I pro-`jects through the space provided centrally of the transverse holdingmember I2. Due to the clearance between the raised portion I4 on thehinge and the transverse holding member I2 a predetermined amount ofplay is provided therebetween, the latter being sufficient to allow forthe proper seating under severe line conditions,

especially considering the aforesaid advantage of uniform distributionof the impact load withl I claim:

1. A swing check valve comprising a casing, a hinge, a closure memberattached to the hinge, a holder, means for attaching the said closuremember to the said hinge, and means cooperating with the said hingehaving a plane surface for contact with a central portion of the saidholder upon seating of the said closure member,

the said centra1 portionV being located substantially between the saidmeans of attachment, whereby the load occasioned by the seating is Ytransmitted to the holder and distributed through Y at least the areadefined by the plane surface.

relation to the hinge member. Further, it will be apparent that theprotrusion I4 may be av separate insertable member I6 as' shown in Figs.4 and 5 and have a clearance shown at I8 greater than the combinedclearancesV I'I and I9 and hence this insertable member I6 performs Vinthe same manner as the integral raised portion I4.

j 2. A swing check valve comprising a casing, a hinge, a closure memberattached to the hinge, a holder, means cooperating with the said holderfor attachment of the said closure member with the said hinge, andVmeans cooperating with the said hinge having a plane surface forcontact l ment is simple and economical by the substituv tion ofa newmember I6;

Accordingly, ther scope of this invention should l Q be measured by theterms lof the claims appended hereto. and not by the particularillustrations used to describe the application of preferred forms of myinvention.

with a centra1 portion-ofV the said holder upon seating of the"saidclosure jmember, the said central portion being located substantiallybetween the said means of attachment, whereby the load occasioned bytheseating is transmitted to the holder and distributed through at leastthe area defined by theplane surface, and the" central portion of theholder providing a recess forV containing the portion of the said meanswhichincludes the plane surface. I

3; A swing check valve comprising a casing; a hinge having a'vtransversely extending' recess therein, a closure member attached tothe hinge," a transverse holding member therefor recessedl vtherein in'opposed relation to the recess in the said hinge, and aseparateymember' positioned 1 within the opening formed by theopposed reces'ses.

VRALPH' G. CARLSON.

